The Air Force’s Falcon Hypersonic Technology Vehicle 2—designed to attack global targets at Mach 20—has disappeared nine minutes into its first test flight, just after separating from its booster. Contact was lost, and it hasn’t been found yet.

The Falcon was supposed to splash down in the Pacific Ocean after a 30-minute, 4,100-nautical-mile test flight. Not to be confused with the unmanned X-37B space shuttle—which launched on April 22—the Falcon Hypersonic Technology Vehicle 2 blasted off last week from the Vandenberg Air Force Base on a Minotaur IV rocket.